Sulfur-containing dispersant and sulfide phosphor paste composition comprising the same

Abstract

A sulfide phosphor paste composition comprising a sulfur-containing dispersant, and a fluorescent film prepared therefrom, are provided. The sulfur-containing dispersant has a dual head structure containing both a carboxyl group and a thiol group or a structure containing a thiol or thiophene group as a head group. An oligomeric sulfur-containing dispersant is also provided. Adsorption of the dispersant on the surface of the sulfide phosphor prevents aggregation of the phosphor particles, and thereby improves the dispersibility of the sulfide phosphor paste composition, the homogeneity of the phosphor in the paste composition, and the density of a film produced from the paste composition. Fluorescent films and display devices produced from the phosphor paste composition exhibit improved luminescent properties and excellent processability.

1. A fluorescent film comprising:
 a phosphor layer comprising
 a phosphor, 
 an organic binder, and 
 a sulfur-containing dispersant selected from the group consisting of:
 a compound of Formula (1) 
 
 
 
       
         
           
           
               
               
           
         
       
       wherein
 X is substituted C 1˜200  alkyl, unsubstituted C 1˜200  alkyl, substituted aryl, unsubstituted aryl, substituted arylalkyl, or unsubstituted arylalkyl, R is H or methyl, and P is a number from 1 to 10;
 a compound of Formula (2) 
 
 
       
         
           
           
               
               
           
         
       
       wherein 1 is a number from 1 to 20;
 and a combination comprising at least one of the foregoing compounds; and 
 a support; 
 
       wherein the phosphor layer is disposed on and in at least partial contact with the support. 
     
     
       2. A sulfur-containing dispersant represented by Formula 5: 
       
         
           
           
               
               
           
         
         wherein 
         A is H or C 1˜12  alkyl, 
         m and n are each independently 1 to 20, and R is H or methyl.